interface/wx/fontenum.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        fontenum.h
   3 // Purpose:     interface of wxFontEnumerator
   4 // Author:      wxWidgets team
   5 // Licence:     wxWindows licence
   6 /////////////////////////////////////////////////////////////////////////////
   7
   8 /**
   9     @class wxFontEnumerator
  10
  11     wxFontEnumerator enumerates either all available fonts on the system or only
  12     the ones with given attributes - either only fixed-width (suited for use in
  13     programs such as terminal emulators and the like) or the fonts available in
  14     the given encoding).
  15
  16     To do this, you just have to call one of EnumerateXXX() functions - either
  17     wxFontEnumerator::EnumerateFacenames() or wxFontEnumerator::EnumerateEncodings()
  18     and the corresponding callback (wxFontEnumerator::OnFacename() or
  19     wxFontEnumerator::OnFontEncoding()) will be called repeatedly until either
  20     all fonts satisfying the specified criteria are exhausted or the callback
  21     returns @false.
  22
  23     @section fontenum_virtual Virtual functions to override
  24
  25     Either OnFacename or OnFontEncoding should be overridden depending on
  26     whether you plan to call EnumerateFacenames or EnumerateEncodings.
  27     Of course, if you call both of them, you should override both functions.
  28
  29     @library{wxcore}
  30     @category{gdi}
  31
  32     @see @ref overview_fontencoding, @ref page_samples_font, wxFont, wxFontMapper
  33 */
  34 class wxFontEnumerator
  35 {
  36 public:
  37     wxFontEnumerator();
  38     virtual ~wxFontEnumerator();
  39
  40     /**
  41         Call OnFontEncoding() for each encoding supported by the given font -
  42         or for each encoding supported by at least some font if @a font is not specified.
  43     */
  44     virtual bool EnumerateEncodings(const wxString& font = wxEmptyString);
  45
  46     /**
  47         Call OnFacename() for each font which supports given encoding (only if
  48         it is not @c wxFONTENCODING_SYSTEM) and is of fixed width
  49         (if @a fixedWidthOnly is @true).
  50
  51         Calling this function with default arguments will result in enumerating all
  52         fonts available on the system.
  53     */
  54     virtual bool EnumerateFacenames(wxFontEncoding encoding = wxFONTENCODING_SYSTEM,
  55                                     bool fixedWidthOnly = false);
  56
  57     /**
  58         Return array of strings containing all encodings found by
  59         EnumerateEncodings().
  60     */
  61     static wxArrayString GetEncodings(const wxString& facename = wxEmptyString);
  62
  63     /**
  64         Return array of strings containing all facenames found by
  65         EnumerateFacenames().
  66     */
  67     static wxArrayString GetFacenames(wxFontEncoding encoding = wxFONTENCODING_SYSTEM,
  68                                       bool fixedWidthOnly = false);
  69
  70     /**
  71         Returns @true if the given string is valid face name, i.e. it's the face name
  72         of an installed font and it can safely be used with wxFont::SetFaceName.
  73     */
  74     static bool IsValidFacename(const wxString& facename);
  75
  76     /**
  77         Called by EnumerateFacenames() for each match.
  78
  79         Return @true to continue enumeration or @false to stop it.
  80     */
  81     virtual bool OnFacename(const wxString& font);
  82
  83     /**
  84         Called by EnumerateEncodings() for each match.
  85
  86         Return @true to continue enumeration or @false to stop it.
  87     */
  88     virtual bool OnFontEncoding(const wxString& font,
  89                                 const wxString& encoding);
  90 };
  91